app.c

AVR单片机C语言程序设计实例精粹

//***************************************************************
// File Name : Gpio.c
// Author    : Steaven
// Created   : 2008-06-09
// Modified  : 
// Revision  : V0.0
//***************************************************************

#include "includes.h"

//local function declaration
void Gpio_Init(void);
void Timer0_Init(void);
void Interrupt_Init(void);

//***************************************************************
// Function    : Hardware_Init
// Input       : none
// Output      : none
// Description : ATmega16 Hardware Initialization
//***************************************************************
void Hardware_Init(void)
{
	Gpio_Init();
    Timer0_Init();
	Interrupt_Init();
}

//***************************************************************
// Function    : Gpio_Init
// Input       : none
// Output      : none
// Description : ATmega16 GPIO Initialization
//***************************************************************
void Gpio_Init(void)
{
    DDRA  = 0x00; //PortA - Input with internal pull-up
    PORTA = 0x00; 
    DDRB  = 0x00; //PortB - Input with internal pull-up
    PORTB = 0x00; 
    DDRC  = 0x03; //PortC - PC[0:1] Output,others inpupt
    PORTC = 0x00; 
    DDRD  = 0x00; //PortD - Input without Output
    PORTD = 0x00; 
}

//***************************************************************
// Function    : Timer0_Init
// Input       : none
// Output      : none
// Description : ATmega16 Timer0 Initialization,10ms Interval
//***************************************************************
void Timer0_Init(void)
{
	TCCR0 = 0x0D;   //1024 division,8M/1024,CTC Mode
	TCNT0 = 0x00;   //Clear Counter
	OCR0  = 78;     //78 * 1024/8M = 10ms 
	TIMSK |= 0x02;  //Enable OCIE0
	TIFR  |= 0x02;  //Clear OCIF0
}

//***************************************************************
// Function    : Interrupt_Init
// Input       : none
// Output      : none
// Description : ATmega16 Interrupt Initialization
//***************************************************************
void Interrupt_Init(void)
{
	SREG |= 0x80;   //Enable Global Interrupt
}

//=========================END OF FILE=========================//